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首页> 外文期刊>Journal of power sources >Is the solid electrolyte interphase in lithium-ion batteries really a solid electrolyte? Transport experiments on lithium bis(oxalato)borate-based model interphases
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Is the solid electrolyte interphase in lithium-ion batteries really a solid electrolyte? Transport experiments on lithium bis(oxalato)borate-based model interphases

机译：锂离子电池中的固态电解质相间真的是固态电解质吗？双（草酸硼酸锂）硼酸锂模型相的输运实验

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摘要

In order to improve the properties of the solid electrolyte interphase (SEI) on the graphite anode in lithium-ion batteries, different electrolyte additives are used, such as lithium bis(oxalate)borate (LiBOB), vinylene carbonate, and fluoroethylene carbonate. It is known that LiBOB increases the SEI resistance, but there is very little fundamental knowledge about the influence of LiBOB on the structure of the SEI as well as on ion and molecule transport mechanisms in the SEI. Here, we study SEIs grown at the interface between a planar glassy carbon electrode and battery electrolytes containing different amounts of LiBOB. The SEIs are characterized by a combination of FIB-SEM, AFM, electrochemical impedance spectroscopy and redox probe experiments. The transport of Li+ ions and of redox molecules becomes slower with increasing LiBOB concentration in the electrolyte, but like observed for a LiBOB-free electrolyte, the effective diffusion coefficients of Li+ ions and ferrocene molecules in the SEIs are virtually identical and show the same temporal evolution after voltammetric SEI formation. This gives strong indication that both Li+ ions and molecules are transported in the liquid electrolyte phase inside the pores of the SEI and thus challenges the common view of a solid-electrolyte-type Li+ transport mechanism in SEIs.
机译：为了改善锂离子电池中石墨阳极上的固体电解质中间相（SEI）的性能，使用了不同的电解质添加剂，例如双（草酸）硼酸锂（LiBOB），碳酸亚乙烯酯和碳酸氟亚乙酯。众所周知，LiBOB会增加SEI的抗性，但是关于LiBOB对SEI的结构以及SEI中离子和分子传输机制的影响的基础知识很少。在这里，我们研究了在平面玻璃碳电极与包含不同量LiBOB的电池电解质之间的界面处生长的SEI。 SEI的特征在于结合了FIB-SEM，AFM，电化学阻抗谱和氧化还原探针实验。 Li +离子和氧化还原分子的运输随着电解质中LiBOB浓度的增加而变慢，但就像无LiBOB的电解质所观察到的那样，SEI中Li +离子和二茂铁分子的有效扩散系数实际上是相同的，并且显示相同的时间伏安SEI形成后的演化这有力地表明，Li +离子和分子都在SEI孔内的液态电解质相中传输，因此挑战了SEI中固体电解质型Li +传输机理的普遍观点。

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